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From: u572112244ea@ucdavis.UUCP (Mark Nagel)
Newsgroups: net.micro.6809,net.micro.trs-80
Subject: CoCo Memory Expansion
Message-ID: <405@ucdavis.UUCP>
Date: Wed, 27-Nov-85 16:30:15 EST
Article-I.D.: ucdavis.405
Posted: Wed Nov 27 16:30:15 1985
Date-Received: Fri, 29-Nov-85 00:11:41 EST
Distribution: net
Organization: University of California, Davis
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Xref: watmath net.micro.6809:633 net.micro.trs-80:508


  I have heard over and over that it is impossible to bank extra
RAM in the CoCo without dragging the entire operating system with
you when you select a new bank.  Although it might be slower memory,
would it be possible to use some of the I/O memory as an address
selector which would then read the data from the extra memory (it would
have to add 64K to the address value) and then return the contents of
that address through the same I/O address?  I don't know too much about
hardware, but is this even possible?  If so, could OS9 use this extra
memory?

					       - Mark Nagel